--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/stage4/stage4.cc	Wed Jan 31 15:32:38 2007 +0100
@@ -0,0 +1,138 @@
+/*
+ * (c) 2003 Mario de Sousa
+ *
+ * Offered to the public under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+ * Public License for more details.
+ *
+ * This code is made available on the understanding that it will not be
+ * used in safety-critical situations without a full and competent review.
+ */
+
+/*
+ * An IEC 61131-3 IL and ST compiler.
+ *
+ * Based on the
+ * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
+ *
+ */
+
+
+/*
+ * This file contains the code that stores the output generated
+ * by each specific version of the 4th stage.
+ */
+
+
+
+
+
+
+// #include <stdio.h>  /* required for NULL */
+#include <string>
+#include <iostream>
+
+
+
+
+#include "stage4.hh"
+
+
+
+
+
+
+stage4out_c::stage4out_c(std::string indent_level) {
+  this->indent_level = indent_level;
+  this->indent_spaces = "";
+}
+
+stage4out_c::~stage4out_c(void) {}
+
+
+void stage4out_c::indent_right(void) {
+  indent_spaces+=indent_level;
+}
+
+void stage4out_c::indent_left(void) {
+  if (indent_spaces.length() >= indent_level.length())
+    indent_spaces.erase(indent_spaces.length() - indent_level.length(), indent_level.length());
+  else
+    indent_spaces.erase();
+}
+
+
+void *stage4out_c::print(const char *str) {
+  std::cout << str;
+  return NULL;
+}
+
+
+void *stage4out_c::printupper(const char *str) {
+  for (int i = 0; str[i] != '\0'; i++)
+    std::cout << (unsigned char)toupper(str[i]);
+  return NULL;
+}
+
+
+void *stage4out_c::print(std::string str) {
+  std::cout << str;
+  return NULL;
+}
+
+
+void *stage4out_c::printupper(std::string str) {
+  /* The string standard class does not have a converter member function to upper case.
+   * We have to do it ourselves, a character at a time...
+   */
+#if 0
+  /* The C++ way of doint things... */
+  for (string::const_iterator p = str.begin(); p != str.end(); ++p)
+    std::cout << (unsigned char)toupper(*p);
+#else
+  /* Or more simply... */
+    printupper(str.c_str());
+#endif
+  return NULL;
+}
+
+
+
+/***********************************************************************/
+/***********************************************************************/
+/***********************************************************************/
+/***********************************************************************/
+/***********************************************************************/
+/***********************************************************************/
+/***********************************************************************/
+/***********************************************************************/
+/***********************************************************************/
+/***********************************************************************/
+
+
+
+/* forward declarations... */
+/* These functions will be implemented in generate_XXX.cc */
+visitor_c *new_code_generator(stage4out_c *s4o);
+void delete_code_generator(visitor_c *code_generator);
+
+
+int stage4(symbol_c *tree_root) {
+  stage4out_c s4o;
+  visitor_c *generate_code = new_code_generator(&s4o);
+
+  if (NULL == generate_code)
+    return -1;
+
+  tree_root->accept(*generate_code);
+
+  delete_code_generator(generate_code);
+
+  return 0;
+}
+